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With the increased application of large eddy simulation techniques, thegeneration of realistic turbulence at inflow boundaries is crucial for theaccuracy of a simulation. The Control Forced Concurrent Precursor Method(CFCPM) proposed in this work combines an existing concurrent precursor methodand a mean flow forcing method with a new extension of the controlled forcingmethod to impose turbulent inflow boundary conditions primarily, although notexclusively, for domains that require periodic boundary conditions. Turbulentinflow boundary conditions are imposed through a region of body forces added tothe momentum equations of the main simulation that transfers the precursorsimulation into the main domain. Controlled forcing planes, which come intoplay as body forces added to the momentum equations on planes perpendicular tothe flow, located in the precursor simulation, allow for specific Reynoldsstress tensors and mean velocities to be imposed. The mean flow controlledforcing method only modifies the mean velocity profiles, leaving thefluctuating velocity field untouched. The proposed fluctuating flow controlledforcing methods extends the application of the original controlled forcingmethod to multiple fluctuating velocity components and couples theircalculation in order to amplify the existing fluctuations present in theprecursor flow field so that prescribed anisotropic Reynolds stress tensors canbe reproduced. The new method was tested on high Reynolds number turbulentboundary layer flow over a wall-mounted cube and low Reynolds number turbulentboundary layer flow over a backward-facing step. It was found that the newextension of the controlled forcing method reduced the development time forboth test cases considered here when compared to not using controlled forcingand only using the original controlled forcing method.

A Control Forced Concurrent Precursor Method for LES Inflow